Filed under: Private equity, ALLTEL Corp (AT), Harrah's Entertainment (HET), First Data (FDC), Blackstone Group L.P (BX)With higher interest rates and pushback in the debt markets, it's been tougher for the private equity folks to get deals done. Just look at the recent IPO of the Blackstone Group (NYSE: BX). The stock has been, well, like a stone.But, according to this week's Barron's , this may be an opportunity. That is, there may be a way to arbitrage returns.Huh? Well, many deals have a spread between the buyout price and the current stock price. Why? Since a deal has not been closed, there's a risk of a deal falling through. With the recent general problems in private equity, there's been a widening of spreads.In fact, there are 10%+ ...